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M6.9 earthquake, Alaska, 1971-02-07

MagnitudeM6.9mw

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Depth30 km

Time (UTC)1971-02-07 02:29

Rank in 197118 / 143among M6+

Rank since 19001775 / 14,458

Energy vs an M6×23approx.

61 km SSW of Adak, Alaska · 51.34, -176.85

M6.5+ within 300 km (largest first)

1957 M8.6M8.6

1986 M8.0M8.0

1996 M7.9M7.9

1905 M7.6M7.6

1929 M7.3M7.3

1996 M7.3M7.3

2007 M7.2M7.2

1905 M7.2M7.2

1957 M7.2M7.2

1957 M7.1M7.1

1970 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1971-02-01	1971-02-01 05:19	25 km	107 km SE of Atka, Alaska
M6.4 1971-01-25	1971-01-25 16:08	40 km	92 km WSW of Adak, Alaska
M6.1 1970-12-01	1970-12-01 21:09	31 km	105 km SE of Adak, Alaska
M6.1 1970-07-18	1970-07-18 01:48	31 km	141 km WSW of Adak, Alaska
M7.1 1970-02-28	1970-02-28 10:52	164 km	58 km WNW of Atka, Alaska
M6.0 1970-02-27	1970-02-27 07:07	16 km	295 km SW of Adak, Alaska
M6.5 1969-10-31	1969-10-31 11:33	38 km	175 km WSW of Adak, Alaska
M6.7 1969-09-12	1969-09-12 08:57	35 km	194 km WSW of Adak, Alaska
M6.9 1969-05-14	1969-05-14 19:32	26 km	231 km WSW of Adak, Alaska
M6.0 1966-05-15	1966-05-15 14:46	32 km	125 km WSW of Adak, Alaska

Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.